Cylindrical body of a newton reflective telescope

ABSTRACT

A cylindrical body of a Newton reflective telescope includes a first cylindrical body and a second cylindrical body combined together. The first cylindrical body has an eyepiece fixed on an outer surface, and a reflective mirror fixed in its interior to be related to the eyepiece. A joint member is connected between the first and the second cylindrical body to enable the first cylindrical body rotate relative to the second cylindrical body as a pivot in such a way that the first and the second cylindrical body both have the center axis coherent, not biasing from each other. Therefore, in using, other person except a user can also look in the eyepieces by rotating the first cylindrical body without necessity of the user to leave the location of the eyepiece.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a cylindrical body of a Newton reflective telescope, particularly to one capable to let other persons except a user to use the same cylindrical body without need of the user to leave the location of the eyepiece after the eyepiece has been focused.

2. Description of the Prior Art

A conventional Newton reflective telescope is shown in FIG. 1, having a cylindrical body 10, and an eyepiece 20 fixed vertically to the side of the cylindrical body 10, and a reflective mirror is fixed in the interior of the cylindrical body 10 for reflecting an image of a target so that a user can see the image reflected by the mirror through the eyepiece 20. In using the conventional Newton reflective telescope, the center axial of the cylindrical body 10 has to be adjusted to a target in advance, and then the eyepiece 20 is adjusted by altering the distance for focusing so the image of the target may seen through the eyepiece 20 clearly. However, if the user wants to share the telescope already in the focused condition with other persons, the user has to leave his location at the eyepiece 20 to let the other person to take the location of the eyepiece 20 for looking in it. This is very inconvenient for operation or teaching students.

SUMMARY OF THE INVENTION

This invention has been devised to offer a cylindrical body of a Newton reflective telescope capable to let other persons except a user to share looking in the eyepiece of the telescope without necessity of the user to leave the location of the eyepiece.

The feature of the invention is a cylindrical body consisting of a first and a second cylindrical body combined together. The first cylindrical body has an eyepiece fixed on its outer surface, and a reflective mirror fixed inside in relative to the eyepiece. A joint is provided between the first and the second cylindrical body to enable the first one rotatable with the second one as a pivot. Then even if the first cylindrical body is rotated, the first and the second cylindrical body can keep their axis coherent, not biasing from each other. Then other persons can look into the eyepiece by rotating the first cylindrical body to turn the eyepiece to the other side of the user without need of the user leaving his position after the eyepiece has been focused to an image of a target.

BRIEF DESCRIPTION OF DRAWINGS

This invention will be better understood by referring to the accompanying drawings, wherein:

FIG. 1 is a perspective view of a conventional Newton reflective telescope;

FIG. 2 is a perspective view of a Newton reflective telescope with a cylindrical body in the present invention;

FIG. 3 is a perspective view of a combined portion of the cylindrical body of a Newton reflective telescope in the present invention;

FIG. 4 is an partial exploded front view of the combined portion of the fitst and the second cylindrical body in the present invention; and,

FIG. 5 is a cross-sectional view of the combined portion of the first and the second cylindrical body in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A preferred embodiment of a cylindrical body of a Newton reflective telescope in the present invention, as shown in FIG. 2, includes a cylindrical body 10 and an eyepiece 20 fixed vertically on a sidewall of the cylindrical body 10. The cylindrical body 10 is consisted of a first cylindrical body 11 and a second cylindrical body 12 combined together by means of a joint member to let the first one 11 rotatable relative to the second one 12 as a pivot.

The first cylindrical body 11 has a reflective mirror fixed in its interior in such a condition that the eyepiece 20 may have a relative position to the reflective mirror kept constant regardless of the rotation of the first cylindrical body 11. As shown in FIGS. 3 and 4, the joint member is constituted of fixing ring 110 fixed around a connecting end of the first cylindrical body 11, and an elastic ring 120 fixed around a connecting end of the second cylindrical body 12.

The fixing ring 110 has an annular projection 111 provided on an inner wall an inner wall, and an annular fitting groove 112 formed on an upper side of the annular projection 112 for receiving the lower end of the first cylindrical body 11.

The second cylindrical body 12 has the elastic ring 120 as described above, and the elastic ring 120 has many elastic teeth 121 formed radially on an upper end and extending out of the second cylindrical body 12, and respectively having a curved tip 1210 flush with the outer surface of the second cylindrical body 12.

After the first cylindrical body 11 is combined with the second cylindrical body 12 by means of the joint member, the inner annular projection 111 of the fixing ring fixed around the first cylindrical body 11 contacts with the end edge of the second cylindrical body 12, with the curved tips 1210 of the elastic teeth 121 fitting stably in the fitting groove 112. Then the expanding-outward elasticity of the teeth 121 produces pressure against the inner annular projection 111 of the first cylindrical body 11 so the inner annular projection 111 may closely contact with the end edge of the second cylindrical body 12, without any gaps between the both. Therefore, no matter the first and the second cylindrical body 11 and 12 are adjusted in any angle to each other, the whole cylindrical body 10 has a constant same axis. Thus in using the telescope, after the eyepiece 20 has been adjusted and focused to a target, the user does not need to leave his position to let other person look in the eyepiece 20 by rotating the first cylindrical body 11 to move the eyepiece to the other side of the user, as shown in FIG. 2, In this way the other person can share with user in using the telescope easily. In spite of the rotation of the first cylindrical body 11, the whole cylindrical body 10 can keep its axis invariable, without necessity of newly adjusting the cylindrical body 10 to be focused to the target, as needed in a conventional Newton reflective telescope.

While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention. 

1. A cylindrical body of a Newton reflective telescope comprising a first cylindrical body and a second cylindrical body combined together, said first cylindrical body provided with an eyepiece on its outer surface and a reflective mirror fixed in its interior, a joint member connected between said first and said second cylindrical body to let said first cylindrical body rotate with the second cylindrical as a pivot, said first and said second cylindrical body having their center axis coherent not biasing even if said first cylindrical body is rotated relative to said second cylindrical body,
 2. The cylindrical body of a Newton reflective telescope as claimed in claim 1, wherein said joint member provided between said first and said second cylindrical body includes: A fixing ring fixed around a connecting end of said first cylindrical body, said fixing ring having one end extending out of the connecting end and an inner annular projection formed in an inner wall, said inner annular projection having an annular groove formed in its upper side: An elastic ring fixed around the connecting end of said second cylindrical body, said elastic ring having many teeth formed radially in an upper end, each said tooth extending out of the connecting end and having a curved-out tip: and, Said inner annular projection of said first cylindrical body contacting the end edge of said second cylindrical body, said curved-out tips of said teeth of said elastic ring of second cylindrical body fitting in said fitting groove of said fixing ring of said first cylindrical body, said elastic ring of said second cylindrical body having an expanding-out pressure against said inner annular projection of said fixing ring of said first cylindrical body so that said annular projection closely and without any gap contacts the end edge of the connecting end of said second cylindrical body, said whole cylindrical body possible having its center axis kept invariable so as to alter the position of said eyepiece for other persons except a user to look in even if said first cylindrical body is rotated relative to said second cylindrical body as a pivot.
 3. The cylindrical body of a Newton reflective telescope as claimed in claim 1, wherein the curved-out tips of said teeth of said elastic ring are always flush with the outer surface of said second cylindrical body.
 4. The cylindrical body of a Newton reflective telescope as claimed in claim 1, wherein said eyepiece is fixed on said first cylindrical body. 